Jitender Paul Sharma* Pages 1 - 11 ( 11 )
The ionic conductivity as well as dielectric studies of polymer electrolytes consisting of polyethylene oxide (PEO) and different (x wt%) of ammonium bifluoride (NH4HF2) (x=1, 2.5, 5, 10 and 15 wt %) have been measured using complex impedance spectroscopic technique. It was found that the polyethylene oxide composed of 10 wt% ammonium bifluoride exhibited the higher conductivity of 5.96x10-6 S/cm as compared to other concentrations of salt at room temperature. Effect of additives i.e. nano sized fumed silica concentration as nano filler and propylene carbonate (PC) concentration as plasticizer on electrical, structural as well as mechanical property studies of polymer electrolytes has also been studied. The maximum conductivity achieved was 1.55× 10-4 S/cm in case of plasticized nanocomposite polymer electrolytes with the simultaneous presence of 3 wt% fumed silica and 0.3 ml propylene carbonate. The variation of ionic conductivity at different temperatures and activation energy values of different polymer electrolytes were also measured. X-ray diffraction (XRD) and differential scanning calorimetry/thermogravimetric analysis (DSC/TGA) studies have been taken to observe the effect of additives on crystalline phase, crystallite size, melting temperature and weight loss of different polymer electrolytes. The effect of additives on the mechanical properties (tensile strength, modulus of elasticity and % elongation at break) of different polymer electrolytes has also been studied by Universal Testing Machine (UTM).
Ionic conductivity, impedance spectroscopy, XRD, DSC, TGA, mechanical properties, plasticizer, fumed silica.
Department of Physics, Himachal Pradesh Technical University, Hamirpur